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i'm really new to sendmail and i'm trying to configure it properly as my server mta.
First of all i'm trying to accomplish some easy tasks as for example masquerade the domain name to show the one i need. I mean, i would like the from field of the email to show
In order to do that i first try with the following, but didn't worked:

define(`confDOMAIN_NAME', `')dnl

Should this worked?

As it didn't worked for me, then i tried:


Last block worked fine, but i still think the first one should have worked.

Could someone point what's the error on the first block?
Should have it worked?
Is the syntax obsolete? Lastly, could someone tell what's the difference between the first and the last block? Thanks in advanced :)

PD: Byusing confMAILER_NAME satement should i be able to set a default user name, i.e. myUser@....

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migrated from Jul 30 '11 at 14:01

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can you clarify what you mean with a "default username" ? – Marco Bizzarri Jul 30 '11 at 14:24

The first block is saying that you should relay the hosts in your domain, as you can check in the sendmail documentation.

The second block, instead, talks about masquerading; you're asking to masquerade both the domain in your message headers and those in the envelope.

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The second block is what you use to masquerade the "from" domain. The first block controls the HELO response of the server. Say the server's actual hostname is Configuring define(confDOMAIN_NAME',')dnl will present the sending server's name as

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